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Brush hones

5th February 1971, Page 125
5th February 1971
Page 125
Page 125, 5th February 1971 — Brush hones
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Honing heads similar in appearance to spiral-wound cylindrical brushes are now, being imported from America and marketed by Vier° (Leamington) Ltd. Sizes to suit bores from 0.87in. diameter to 17.5in, diameter will be available, all of them designed to be driven by a hand power tool running at between 300 and 750 rpm.

The honing brushes, named Micro-Hone, have a twisted-mildsteel shaft holding nylon bristles in spiralformation each tipped with a roughly spherical piece of silicone carbide. Those for cylinder bores and having double spirals are produced in nominal sizes covering from 3.5in. to Bin. in 0.5in. steps and in each case the hones can be used on bores up to 0.5in. smaller than the nominal: there are four single-spiral units for bore sizes from 3.625in. to 5.125in, again in 0.5in, steps. There is no appreciable removal of stock when using the hones and they are not, in fact, designed to remove material. The main function is to produce a suitable finish on the bore after reboring or when glazed to allow improved seating of piston rings. The hones clean the surface of the cylinder wall and when

moved up and down in the bore at about one stroke per second. the job is likely to take between 20 and 30 sec and produce a good cross-hatch pattern. When used properly each brush hone can be employed on over 1,000 bores.

Marketed by: Nicro (Leamington) Ltd, Fromehall Mill, Stroud, Glos. Price (examples): double-spiral 3.5in. diameter £11 12s, 5.5in. £18 14s 6d. Single-spiral 5.125in. £12 5s 8d.

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